Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics , Passenger Seat Schematics , or Rear Seat Schematics Connector End View Reference: Power Seat Connector End Views or Power Door Systems Connector End Views in Doors DEFINITION: Both the heated seat cushion and the seat back do not get warm. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Verify that the Heated Seat Inoperative complaint is present. Does the heated seat system operate as described in the description and operation? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the Heated Seat Temperature parameter momentarily change state? | -- | Go to Step 6 | Go to Step 4 |
4 | Measure the voltage from the battery voltage circuit of the heated seat switch to a good ground. Does the voltage measure within the specified range? | 9-15 V | Go to Step 5 | Go to Step 23 |
5 |
Does the test lamp illuminate? | -- | Go to Step 26 | Go to Step 30 |
6 | Measure the voltage from the battery positive voltage circuit of the heated seat module to a good ground. Does the voltage measure within the specified range? | 9-15 V | Go to Step 7 | Go to Step 32 |
7 | Measure the voltage from the battery positive voltage circuit of the heated seat module to the ground circuit of the heated seat module. Does the voltage measure within the specified range? | 9-15 V | Go to Step 8 | Go to Step 33 |
8 | Measure the voltage from the ignition 3 voltage circuit of the heated seat module to a good ground. Does the voltage measure within the specified range? | 9-15 V | Go to Step 9 | Go to Step 34 |
Does the measured voltage momentarily change state? | -- | Go to Step 11 | Go to Step 10 | |
10 |
Does the voltage measure within the specified range? | 4.50-5.50 V | Go to Step 28 | Go to Step 24 |
11 |
Does the test lamp illuminate? | -- | Go to Step 27 | Go to Step 12 |
12 |
Does the resistance measure less than the specified value? | 10 ohms | Go to Step 13 | Go to Step 20 |
13 | Measure the resistance between the heated seat back element supply voltage circuit and the heated seat back element control circuit of the module connector. Does the resistance measure less than the specified value? | 10 ohms | Go to Step 14 | Go to Step 20 |
14 |
Important: If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat. Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the seat cushion temperature sensor. Does the resistance measure within the specified range? | 280 ohms-300 K ohms | Go to Step 15 | Go to Step 21 |
15 |
Important: If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat. Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the seat back temperature sensor. Does the resistance measure within the specified range? | 280 ohms-300 K ohms | Go to Step 16 | Go to Step 21 |
16 | Test the heated seat element control circuits between the heated seat module and the seat heating elements for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 17 |
17 | Test the temperature sensor signal circuits between the heated seat module and the temperature sensors for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 18 |
18 | Test for continuity between the temperature sensor signal circuits and the heated seat element supply voltage circuits of the heated seat module connector C2. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 36 | Go to Step 19 |
19 |
Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 29 |
20 | Test the element supply voltage circuit and the element control circuit between the heated seat module and the seat heating element for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 31 |
21 | Test the temperature sensor signal circuit and the sensor low reference circuit between the heated seat module and the temperature sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 22 |
22 | Test the temperature sensor signal circuit between the heated seat module and the temperature sensor for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 31 |
23 | Test the heated seat switch supply voltage circuit between the door module and the heated seat switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 28 |
24 | Test the heated seat temperature signal circuit between the door module and the heated seat module for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 25 |
25 | Test the heated seat temperature signal circuit between the door module and the heated seat module for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 29 |
26 | Test the heated seat temperature switch signal circuit between the heated seat switch and the door module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 28 |
27 | Test the heated seat back only mode signal circuit between the door module and the heated seat module for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 28 |
28 | Inspect for poor connections at the harness connector of the door control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 35 |
29 | Inspect for poor connections at the harness connector of the heated seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 37 |
30 | Inspect for poor connections at the harness connector of the heated seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 36 |
31 | Inspect for poor connections at the harness connector of the suspect heated seat cushion or seat back heating element/sensor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 39 | Go to Step 38 |
32 | Repair the open or short to ground in the battery positive voltage circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 39 | -- |
33 | Repair the open in the ground circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 39 | -- |
34 | Repair the open in the ignition 3 voltage circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 39 | -- |
35 | Replace the door control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 39 | -- |
36 | Replace the heated seat switch. Refer to Rear Seat Heater Switch Replacement . Did you complete the replacement? | -- | Go to Step 39 | -- |
37 | Replace the heated seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 39 | -- |
38 | Replace the appropriate heated seat cushion or seat back heater/sensor assembly. Refer to Rear Seat Cushion Heater Replacement or Rear Seat Back Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 39 | -- |
39 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
